/*
* Copyright (c) 2014 Advanced Micro Devices, Inc.
* Copyright (c) 2016 Aaron Watry
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#if __CLC_FPSIZE == 32
#ifdef __CLC_SCALAR
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE fdim(__CLC_GENTYPE x, __CLC_GENTYPE y) {
if (__builtin_isnan(x) || __builtin_isnan(y))
return as_float(QNANBITPATT_SP32);
return fmax(x - y, 0.0f);
}
#define __CLC_FDIM_VEC(width) \
_CLC_OVERLOAD _CLC_DEF float##width fdim(float##width x, float##width y) { \
/* Determine if x or y is NaN. */ \
/* Vector true is -1, i.e. all-bits-set, and NaN==NaN is false. */ \
/* If either is NaN, then ~((x==x) & (y==y)) will be 0 (e.g. ~(-1)), as will n. */ \
int##width n = ~((x == x) & (y == y)) & QNANBITPATT_SP32; \
/* Calculate x-y if x>y, otherwise positive 0, again taking */ \
/* advantage of vector true being all-bits-set. */ \
int##width r = (x > y) & as_int##width(x - y); \
return as_float##width(n | r); \
}
__CLC_FDIM_VEC(2)
__CLC_FDIM_VEC(3)
__CLC_FDIM_VEC(4)
__CLC_FDIM_VEC(8)
__CLC_FDIM_VEC(16)
#undef __CLC_FDIM_VEC
#endif
#endif
#if __CLC_FPSIZE == 64
#ifdef __CLC_SCALAR
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE fdim(__CLC_GENTYPE x, private __CLC_GENTYPE y) {
long n = -(isnan(x) | isnan(y)) & QNANBITPATT_DP64;
long r = -(x > y) & as_long(x - y);
return as_double(n | r);
}
#define __CLC_FDIM_VEC(width) \
_CLC_OVERLOAD _CLC_DEF double##width fdim(double##width x, double##width y) { \
/* See comment in float implementation for explanation. */ \
long##width n = ~((x == x) & (y == y)) & QNANBITPATT_DP64; \
long##width r = (x > y) & as_long##width(x - y); \
return as_double##width(n | r); \
}
__CLC_FDIM_VEC(2)
__CLC_FDIM_VEC(3)
__CLC_FDIM_VEC(4)
__CLC_FDIM_VEC(8)
__CLC_FDIM_VEC(16)
#undef __CLC_FDIM_VEC
#endif
#endif
#if __CLC_FPSIZE == 16
#ifdef __CLC_SCALAR
#define QNANBITPATT_FP16 ((short)0x7e00)
_CLC_OVERLOAD _CLC_DEF __CLC_GENTYPE fdim(__CLC_GENTYPE x,
private __CLC_GENTYPE y) {
short n = -(isnan(x) | isnan(y)) & QNANBITPATT_FP16;
short r = -(x > y) & as_short(x - y);
return as_half((short)(n | r));
}
#define __CLC_FDIM_VEC(width) \
_CLC_OVERLOAD _CLC_DEF half##width fdim(half##width x, half##width y) { \
/* See comment in float implementation for explanation. */ \
short##width n = ~((x == x) & (y == y)) & QNANBITPATT_FP16; \
short##width r = (x > y) & as_short##width(x - y); \
return as_half##width(n | r); \
}
__CLC_FDIM_VEC(2)
__CLC_FDIM_VEC(3)
__CLC_FDIM_VEC(4)
__CLC_FDIM_VEC(8)
__CLC_FDIM_VEC(16)
#undef __CLC_FDIM_VEC
#endif
#endif
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